I'm surprised that the backup system is wet pipe rather than dry pipe
pre-action? May I ask why?

Thanks!

Richard

At 06:28 PM 2/18/2004 -0500, you wrote:
>Hannah - For the Library of Congress' main new collections storage
>facility at the National Audio-Visual Conservation Center in
Culpeper,
>Virginia, we are utilizing a layered dual-system fire protection
>approach, with an FM200 gas-based system as the initial primary
>suppression agent back up by a wet-pipe sprinkler system.